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eventVerified

Catherine de Médicis summons Nostredame to court to explain almanac threats and to cast horoscopes of her children

Almanacs and the 1555 book are separate instruments that made the summons possible. Catherine’s summons follows the 1555 almanacs and the first Prophéties, conventionally 1555–56, before the 1564 Provence visit that produced the Charles IX title. In the causal graph this event weakens Political Polarization, a driver that weakens Having a say in government — an improving welfare path.

Sources: [1][2]

Read the full account

Catherine’s own Britannica page independently places her as queen consort in those years.

Context

Polarising court astrology is neighbouring. Almanacs and the 1555 book are separate instruments that made the summons possible.

Nostradamus’s documented role is bounded by other offices and collaborators named in the sources below.

Catherine’s summons follows the 1555 almanacs and the first Prophéties, conventionally 1555–56, before the 1564 Provence visit that produced the Charles IX title. Children’s nativities are a court file, not a public welfare statistic.

Who was responsible

Contribution type and responsibility level for each recorded actor — not sole-author shorthand.

  • Nostradamus

    Person

    Direct responsibility

    responsibility level 0.4 · verified

What changed

Fact → Driver → Indicator. Relationship strength orders the paths; it is not the observed indicator movement.

    1. FactCatherine de Médicis summons Nostredame to court to explain almanac threats and to cast horoscopes of her children
    2. weakensDriverPolitical Polarization
    3. weakensIndicators (2)Having a say in government
    Improving path

    impact weight 0.5 · Effect from 1 January 1556 · verified

    • Having a say in government

      via Political Polarization

      Better

      Weakens · Relationship strength 0.23 (weight 0.5 × strength 0.45)

      Observed

      29.8% of population aged 16-65 years · 8.13 below the normal line (2023)

      Worse than normal

      Two readings: 30.2% of population aged 16-65 years (2021) and 29.8% of population aged 16-65 years (2023).

      20212023

      Above normal = better

    • Rule of Law Gap from the Highest Governance Score

      via Political Polarization

      Better

      Strengthens · Relationship strength 0.23 (weight 0.5 × strength 0.45)

      Observed

      43.9 Score · 43.9 above the normal line (2024)

      Worse than normal

      26 readings, 1996–2024: rose from 43 Score to 43.9 Score.

      Normal is zero · any amount = worse

Evidence

The sources behind this fact and its verification state.

Verified2 sources on file
  1. 1.Britannica — Catherine de MédicisEncyclopaedia Britannica · High credibility · verified
  2. 2.Britannica — NostradamusEncyclopaedia Britannica · High credibility · verified
What the sources establish

Britannica records that after some prophecies appeared fulfilled he was invited to Catherine de Médicis’ court, where he cast horoscopes of her children.

Nostradamus did not file a later UNESCO form, a later Loeb colophon, or a later museum label as a personal act.

Causal path

How this event connects to drivers and indicators in the graph.

  1. ActorNostradamus
  2. contributed toFactCatherine de Médicis summons Nostredame to court to explain almanac threats and to cast horoscopes of her children
  3. weakensDriverPolitical Polarization
  4. weakensIndicatorHaving a say in government

Cite this page

Factrail. (2026). Catherine de Médicis summons Nostredame to court to explain almanac threats and to cast horoscopes of her children. Factrail. https://factrail.ai/facts/nos-catherine-horoscopes-1556

https://factrail.ai/facts/nos-catherine-horoscopes-1556

Accessed 16 October 2026.

By the Factrail desk · Method: how we source and score · Last reviewed

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